I'm also getting the same error, as several others:
Couldn't open the process (Error: f401)
Make sure that you actually started a game.
This is with BOTW, which was working previously. Obviously netcheat is running otherwise it will not even attach with nc.
Running Kosmos 13.0.1 / Atmosphere 0.9.2 on 8.01 CFW with SYSNAND.
And Edizone is useless, its RAM search function seems to find nothing and when I select to edit a BOTW save file it just says "No items present!".
Besides switching between the game and edizone to pinpoint the right address is much more time consuming then running nc.